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Astern propulsion (as applied to a ship) is a maneuver in which a ship's propelling mechanism is used to develop thrust in a retrograde direction. Astern propulsion does not necessarily imply the ship is moving astern ( in reverse ); astern propulsion is used to slow a ship by applying a force in the direction of the bow of the ship, instead of ...
Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller, or less frequently, in pump-jets, an ...
Articles about marine propulsion ... Astern propulsion; Azimuth thruster; Azipod; B. ... Schottel (company) Screw steamer; Slow steaming;
The superiority of podded propulsion in icebreaking merchant ships, especially when running astern, was proved when Finnish product tankers Uikku and Lunni were converted to Azipod propulsion in 1993 and 1994, respectively. Even though the ships were originally designed with icebreaking capability in mind, after the conversion ice resistance in ...
A guardian valve is a valve used in marine steam turbine propulsion plants to prevent steam from leaking into the astern turbine while the vessel is operating in the ahead mode. It is normally installed between the astern throttle valve and the astern elements of the low pressure (LP) turbine. Typically only the LP turbine of a steam ship's ...
Slow astern; Half astern; Full astern; Emergency astern (1940–present) Any orders could also be accompanied by an RPM order, giving the precise engine speed desired. Many modern ships have the following dial indications: Full ahead navigation (on notice to increase or reduce) Full ahead; Half ahead; Slow ahead; Dead slow ahead; Stop; Dead ...
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The superiority of electric podded propulsion in icebreaking ships, especially when running astern, was proved when the first propulsion pod was installed on fairway maintenance vessel Seili, owned by the Finnish Maritime Administration, in 1990. Before the conversion the ship could not break ice astern at all, but after the propeller and ...